﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Example42
{
    class Polygon
    {
        protected int width, height;
        public void setValues(int a, int b)
        {
            width = a;
            height = b;
        }
    }
    class Rectangle : Polygon
    {
        public int area()
        {
             return (width * height);
        }
      }
    class Triangle : Polygon
    {
        public int area()
        {
             return (width * height / 2);
        }
     }
    
    class Program
    {
        static void Main(string[] args)
        {
            Rectangle rect=new Rectangle();
            Triangle trgl=new Triangle();
            rect.setValues(4,5);
            trgl.setValues(4,5);
            Console.WriteLine("rect a:{0}",rect.area());
            Console.WriteLine("trgl b:{0}",trgl.area());
            Console.ReadLine();
        }
    }
}
